Avoid planting invasive species this spring, group warns

Hamilton Spectator

15-05-2025

Just ahead of what is typically the busy start to the gardening season, an environmental group is urging people to avoid invasive species when shopping at greenhouses.
Monica Liedtke, terrestrial invasive plants coordinator at the Invasive Species Centre, stresses the importance of choosing non-invasive species.
'Invasive species spread very rapidly, and they cause harm to the environment, the economy, society and human health,' noted Liedtke.
'They often compete with native species, which disrupt natural ecosystems, so that, in return, it reduces biodiversity, and then degrades natural habitat for pollinators, birds and other native wildlife.'
One type of invasive species found at garden stores is ground cover plants like periwinkle, English ivy, and yellow archangel. The problem with these plants and ground covers, in particular, is that they tend to spread very quickly.
'They don't pay attention to boundaries. So they will go over and under the fences,' said Liedtke.
This is especially bad when you live near a natural ecosystem, when these invasive plants go from your yard and take over a natural ecosystem.
That kind of creep might not be welcomed by your neighbours, she notes, adding that the species you plant might be unknown to the next inhabitants if you move.
'Anyone after that comes in and they don't know what the plants in the garden are, they may just let it continue to spread,' she explained.
'They might give it away to friends or family. So, in the long run, it becomes a lot more costly. And then you're also burdening those new neighbours or homeowners.'
The ISC lists five practices that property owners and gardeners can use to reduce the spread of invasive species.
The first idea is to learn which plants are invasive in your area and avoid adding them to your garden.
'Certain plants pose challenges in different regions of Canada due to climate, terrain, and other environmental conditions. Look for information specific to your area,' the agency notes.
The second tip is always looking at seed packets to ensure you are not accidentally buying these invasive species. Wildflower mixes often contain invasive species like bachelor's button, periwinkle and baby's breath, noted ISC executive director Colin Cassin.
ISC added that you should also look for alternative and scientific names.
'People may not be aware that what they are purchasing are invasive seeds or plants,' said Liedtke.
'That's where awareness and education come in. We encourage everyone buying seeds and plants to research with reputable sources.'
Choosing native plants is also a great way to add to the beauty of your garden while also supporting local wildlife and ecosystems, said Liedtke. The ISC has a 'Grow Me Instead' guide to help you choose plants that can replace the invasive species you want to remove.
'It's a fantastic guide with visuals. It's really helpful for species that you might already have in your garden, and you're looking to remove it and plant it with another native plant.'
The final two tips they offered go hand in hand: inspect your property for invasive plants and learning how to dispose of them properly.
They urge homeowners and gardeners to regularly check their property for invasive plants and prevent them from spreading. If you find an invasive species, you can properly dispose of it and make sure to report the sighting.
'Even small changes in the backyard can really make a big difference, removing any invasive species you have, planting native species in their place,' added Liedtke.
For resources and information on where to report a sighting, see
www.invasivespeciescentre.ca
.